Which term describes the coil connected to the power source in a transformer?

Which term describes the coil connected to the power source in a transformer?

• A. Core
• B. Magnetic path
• C. Primary winding
• D. Secondary winding

Answer: (C)

The coil connected to the power source is the primary winding. In a transformer, energy transfer happens because the current in the input winding creates a changing magnetic flux in the core, which then inductively couples to the other winding to produce voltage on the output side. The primary winding is defined by being the input side attached to the source, while the secondary winding is the output side that feeds the load. The core is the magnetic material that provides a low-reluctance path for the flux, and the magnetic path describes how the flux travels through the core—not a coil. So the term for the coil tied to the power source is the primary winding.

The coil connected to the power source is the primary winding. In a transformer, energy transfer happens because the current in the input winding creates a changing magnetic flux in the core, which then inductively couples to the other winding to produce voltage on the output side. The primary winding is defined by being the input side attached to the source, while the secondary winding is the output side that feeds the load. The core is the magnetic material that provides a low-reluctance path for the flux, and the magnetic path describes how the flux travels through the core—not a coil. So the term for the coil tied to the power source is the primary winding.